Plumb CompositedDisplayList to WebViewImpl

Source/core/page/ChromeClient.h

Index: Source/core/page/ChromeClient.h
diff --git a/Source/core/page/ChromeClient.h b/Source/core/page/ChromeClient.h
index f14b29f7bba9fecf1143d1d744b59e9a7b04948d..50a9e46abeb8f1e526066941e640796017803121 100644
--- a/Source/core/page/ChromeClient.h
+++ b/Source/core/page/ChromeClient.h
@@ -32,6 +32,7 @@
 #include "platform/Cursor.h"
 #include "platform/HostWindow.h"
 #include "platform/PopupMenu.h"
+#include "platform/graphics/CompositedDisplayList.h"
 #include "platform/heap/Handle.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "public/platform/WebFocusType.h"
@@ -183,6 +184,9 @@ public:
     // one. Otherwise it sets it for the WebViewImpl.
     virtual void attachRootGraphicsLayer(GraphicsLayer*, LocalFrame* localRoot) = 0;
 
+    virtual void setCompositedDisplayList(PassOwnPtr<CompositedDisplayList>) { }
+    virtual CompositedDisplayList* compositedDisplayListForTesting() { return nullptr; }
+
     virtual void attachCompositorAnimationTimeline(WebCompositorAnimationTimeline*, LocalFrame* localRoot) { }
     virtual void detachCompositorAnimationTimeline(WebCompositorAnimationTimeline*, LocalFrame* localRoot) { }